rust/tests/ui/generic-const-items/const-trait-impl.rs

// check-pass

// Test that we can call methods from const trait impls inside of generic const items.

#![feature(generic_const_items, const_trait_impl, effects)]
#![allow(incomplete_features)]
#![crate_type = "lib"]

const CREATE<T: const Create>: T = T::create();

pub const K0: i32 = CREATE::<i32>;
pub const K1: i32 = CREATE; // arg inferred

#[const_trait]
trait Create {
    fn create() -> Self;
}

impl const Create for i32 {
    fn create() -> i32 {
        4096
    }
}

trait Mod { // doesn't need to be a `#[const_trait]`
    const CREATE<T: const Create>: T;
}

impl Mod for () {
    const CREATE<T: const Create>: T = T::create();
}

pub const K2: i32 = <() as Mod>::CREATE::<i32>;